Re: How valuable are upgraded HP48G's? Message #4 Posted by Han on 15 Dec 2005, 8:36 p.m., in response to message #3 by tomc
Hi Tom,
Well, the suggestion of placing the calculator on eBay sounds like the perfect way to find out. Though, I would rather not sell any of my HP48s =). I am merely curious what collectors think of modified calculators.
As for the method I used to open the HPs, I used a method that I figured out myself -- though it turns out someone else has also done it before. By using just a flat edge, you can open the HP without doing any cosmetic or even structural damage. And it's quite easy. Even when you put everything back together, the calculator feels just as solid as before because the rivets will still pop back into place.
I took many photos which I hope to put together to explain the entire process. I will have some time in January to make further upgrades (adding in port 2), and will put together a zip file containing all the photos and explanations. I've already designed a PCB board that will make use of SMD RAM chips as oppposed to the bulky DIP chips. I learned quite a bit about the HP48, and hope to share what I've found out. If you have any questions, I'd be more than happy to answer them to the best of my ability.
Han
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